Adjustable well-drilling bit



Speecatiom of Letes Estant.

Pefifsmed Feb@ 1922sepel object ei huiden@ eg e5? sufi l @new 'She hedexg .jy removed and h i sery se remove one see ef the eu' replace With Qu-heiss which Wh f beides-ms e geest-er or lesser eme bis, es may be requite A 'uhef object o p'eduee simple and inexpensive y which W die invenieuf: is 25e Qevlee Acomprising s cenn'al hub 2., rede arms 3 t being mw neces Y Refe'ring new mem pecicusy te hecharacters of reference en ehe drawings, he numeral l denotes' che eeheadi mi spider y 6@ and fehreaed endepwerdly prejecfing and shank adepied to :iis im@ ehe dline; sem. f

center bili; 5 of :my desire@ ferm but preemby of cypeshown is provide' wiee shank fs, which bears egains der side 'of Mge hub 2,ssd shank:

pefjfgen l side. sang 7 formed shaped erlee prevlded 1m lhe me 'i ffl ias bit is hein pesiien screw 8 extending hreugh he shC mesu; mei; inne? ems egains' he s l veut-fuers 9 px'ejeeing "dlerefee Lemme@ se as te 'i eevjc'e suiebe ce egese Each cu'ef has ,a Y

'herewibh end pmjeeting upwm f Ehem am, being adapted; ze seat i e seeks?. M mm 3, cap-serews i2 being em peye 'ie heid the eusers from amg eue; and Whehmey be eemeved at WHL I The' mdie ewbiefrs efe el interchangeable and. of cours" eli symmetriee ne eque b Wm time evem that by removing; one of msse cuafei's eed re placing there Wish @noti/e3? set of a dffexem; emgeh vereus sized Wells may be bored, enh? requizemem any seis being the@ project beyond she ends e ehe campers shs 'me spleiey arms 'fue eene ol, which e1' course Y vice as 'substantially fulfills readily seen that haveproduced such a-dethe objects 'of the invention as set forth herein.

While this specification sets forth in. de

tail the present and preferred construction of the device, still in practice such deviaf tions from such detail may be resorted' to l and do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as ne7 and useful-and desire to secure byLetters Patent is:

l. A well drilling bit comprising a spider adapted for connection to a drilling stem,

a removable center bit and 'removable radialcutters secured to the spider and projecting -therebeyond 2.' A drilling bit comprising a spider adapted for connection to a' drilling stem, said spider having radial arms, a center bit positioned axially of thespider, and a radial cutter Vunder each arm extending the 'full length thereof.

3. A Well drilling bit comprising a spider adapted for connection to a drillingstem, said spider comprising a hub and radial arms, a center bit positioned axially of the hub and thereunder and removably secured thereto, and radial cutters under the larms and projecting therebeyond and removably secured thereto. l

4.-. A Well drilling bit comprising a spider adapted for 'connection to a drilling stem, said spider having radial arms, a center bit therewith, the radial cutters extending beyond the ends of the arms and their inner ends bearing against the shank of the center bit.

6. A drilling bit comprising a spider adapted' for connection to a drilling-stem, said splder having radial arms, a center bit positioned axially of the spider, and a radial cutter under'each arm extending from the center bit to a point beyond the outer end of said arm. 1

7 A drilling bit comprising a spider adaptedforconnection to a ldrilling stem and having radial arms, a `center bit mounted axially of the spider thereunder and having a shank portion, and a radial cutter mounted under each arm, the inner' end of each cutter bearing against the shank of the center bit. I

In testimony whereof I aix m si nature.

GEORGE CA E EY. 

